.course-list { 
    list-style: none; 
    padding: 0; 
}
.course-list li { 
    margin: 10px 0; 
}
.course-title { 
    cursor: pointer; 
    color: #0073aa; 
    font-size: 18px; 
}
.course-title:hover { 
    text-decoration: underline; 
}
.arrow { 
    font-size: 12px; 
    margin-left: 5px; 
}
#join-form { 
    margin-top: 20px; 
    background: #f9f9f9; 
    padding: 20px; 
    border-radius: 8px; 
    box-shadow: 0 2px 5px rgba(0,0,0,0.1); 
}
.form-section { 
    margin-bottom: 20px; 
}
.form-section h3 { 
    font-size: 16px; 
    color: #333; 
    margin-bottom: 10px; 
    border-bottom: 1px solid #ddd; 
    padding-bottom: 5px; 
}
#join-form input[type="text"],
#join-form input[type="tel"],
#join-form input[type="email"] { 
    padding: 10px; 
    margin: 5px 0; 
    width: 100%; 
    max-width: 300px; 
    border: 1px solid #ddd; 
    border-radius: 4px; 
    transition: opacity 0.5s ease, margin-top 0.5s ease; 
    box-sizing: border-box; 
}
#join-form input:focus { 
    border-color: #0073aa; 
    outline: none; 
}
#join-form button { 
    padding: 10px 20px; 
    background: #0073aa; 
    color: #fff; 
    border: none; 
    border-radius: 4px; 
    cursor: pointer; 
    transition: opacity 0.5s ease, margin-top 0.5s ease, background 0.3s ease; 
}
#join-form button:hover { 
    background: #005d8a; 
}
#form-feedback { 
    display: block; 
    margin-top: 10px; 
    color: #666; 
    font-style: italic; 
    transition: opacity 0.5s ease; 
}